Lock



Aug. 23, 1949. I E. N. JACOB] LOCK 2 Shee'ts-Sheet 1 Filed Dec. 10, 1947 l MW 9 H Aug. 23, 1949. E. N. JACOB! 2,480,026

LOCK

Filed Dec. 10, 1947 2 Sheets-Sheet 2 Patented Aug. 23,1949

UNITED STATES PATENT OFFICE LOCK Edward N; Jacobi, Milwaukee, Wis., assignor to Briggs & Stratton Corporation, Milwaukee, Wis., a corporation of Delaware Application December 10, 1947, Serial No. 790,882

BClaims. (Cl. 70-368) This invention relates to locks of the rotatable cylinder type and the main object of the invention resides in the provision of improved retaining means for releasably securing the lock cylinder in its mounting member or casing.

A more specific object of this invention resides in the provision of a cylinder retaining member which is carried by the casing of the look at the interior thereof so as to be enclosed by the casing, but which may be readily disabled from the exterior of the casing to permit removal of the lock cylinder from the casing bore.

Another object of this invention resides in the provision of a novel retaining element for removable cylinder locks wherein the retaining element has the additional functions of limiting rotation of the cylinder as well as preventing rattling of the cylinder in the bore.

Still another object of this invention resides in the provision of an improved retaining member for removable cylinder locks, and in the novel manner of mounting the retaining member on the lock casing.

With the above and other objects in view, which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a side elevational view of a removable cylinder lock having portions of its casing broken away to illustrate the application of this invention thereto;

Figure 2 is a cross sectional view taken through Figure 1 on the plane of the line 22 and showing the lock cylinder in one of its limits of rotation;

Figure 3 is a cross sectional view similar to Figure 2 but illustrating the lock cylinder in its other limit of rotation;

Figure 4 is a perspective view of the lock having portions of the casing broken away to illustrate the disposition of the retaining member for the cylinder;

Figure 5 is a perspective view of the retaining member per se;

Figure 6 is a fragmentary detail viewlshown 2 partly in elevation and partly in section and H- lustrating two of the functions of the retaining member;

' Figure 7 is a view partly in elevation and partly in section illustrating'the manner in which the retaining member is disabled to enable axial withdrawal of the lock cylinder from the casing bore and showing the cylinder partially withdrawn from the casing; and

Figure 8 is a perspective view of the lock cylinder and the casing showing the parts separated and looking into the front end of the casing.

Referring now tothe accompanying drawings in which like numerals indicate like parts, the numeral 5 designates the casing of a removable cylinder lock, and as is customary the casing has a bore 6 to rotatably receive the lock cylinder 1 therein. The bore 6 opens to the front of the casing through a counterbore 6 of a size to rotatably receive an enlarged head 1 on the cylinder.

The casing likewise has an enlarged head 8, the underside of which is adapted to abut the surface of a support for the lock; and because of its exposed condition the head is preferably encased by a ring-like escutcheon cap 9. The cap has a front flange In which overlies the front of the casing and is apertured to receive the head 1' of the cylinder, and is securely fixed on the head by a rear flange l I spun around the rear of the head on the casing as shown.

According to the present invention, the lock cylinder 1 is freely rotatably' and slidably received in the casing bore so as to readily enable removal of the cylinder from the casing. Insertion of the cylinder into the bore is limited by the engagement of the enlarged head 1' on the cylinder with the bottom l2 of the counterbore 6'.

Axial sliding motion of the lock cylinder out of the casing bore is prevented by means of a novel retaining member [4. The retaining member is in the form of a relatively flat substantially T- shaped spring blade having a stem l5 and a crosshead It at one end of the stem as seen best in Figure 5. a

The stem l5 of the retaining blade is received in a longitudinal groove I! in the casing communicating with the bore 6 and extending from the counterbore at the front of the casing to a point near the rear of the casing. The crosshead IE on the retaining member is received flat- Wise in a relatively narrow longitudinal slit [9 cut into the front end of the casing'crosswise of the groove H and nearly tangent to the bore 6.

The blade is fixedly held in place on the casing 4 the legs are assisted by the engagement of the opposite side edges of the stem l5 with the sides of the longitudinal groove ll in which it is received. r

The free end of the stem I5 is disposed adjacent to the rear of the lock cylinder, and the extremity of the stem is bent inwardly toward the axis of the casing bore to provide a hook 24 which enters an arcuate groove in the rear portion of the lock cylinder to prevent axial withdrawal of the cylinder from thecasing bore. Aswill be apparent;

fronra. consideration of Figure 6, the. groove 25. produces a pair of axially spaced shoulders 26 and; 2'! normal to the axis of the cylinder and with the shoulder 26 rearmost and facing the. front-of the lock. V

v The outer end of the hook 24 engages the shoulder 26, as indicated previously, to preclude withdrawal of the cylinder from, the casing; and the underside of the hook engages the exterior of the lock cylinder at the shoulder 2'! (see Figure 6-) under a degree of spring pressure to prevent. rattling of the lock cylinder in the casing bore. 7

The retaining member may be readily disabled manually to allow removal of the lock cylinder from the casing bore by a suitable tool 38 inserted through an access hole 3| in the side of the casing in line with the hook, and by which the hook. may be lifted to retract the same from the arcuate groove 25 in the cylinder as shown in Figure 22 To facilitate engagement of the tool with the hook the latter is provided with a notch 32 in its outer edge to receive the extremity of the tool and to allow the tool to engage beneath the hook. Attention. is directed to the fact that the blade is moved to-aninoperative position freeing the lock cylinder for withdrawal from the casing bore against the spring bias on the retaining blade which tends to hold the stem of the blade in an inwardlyfiexed' operative condition. 7

It is also important to note that the angle of the hook causes the same to be cammed' upwardly out of the bore by the lock cylinder during insertion thereof into the casing; the hook automatically snapping into place ahead of the shoulder 26 when the cylinder reaches its proper axial position within the casing.

Another featureof the retaining member of this invention resides in the fact that the hook 24 may be employed to limit rotation of the lock cylinder in the casing bore. For this purpose the length i of the arcuate groove 25 in the cylinder is so related to the width of the hook as to permit the cylinder to rotate 90 between its locked and unlocked positions shown in Figures 3 and 2 respectively. In the locked condition of thecylinder the abutment 33 atone end of the arcu ate :groove 25 engages one sideedge of the'hook and upon clockwise rotation of the cylinder from its Figure 3 position through an arc of 90, the

abutment 34 at the other end of the groove 25; engages the'opposite side edge of the hook to define the unlocked position of thecylinder.

Although the lock of this invention is shown '4 provided with an operating shaft 36 drivingly connected with the lock cylinder by means of universal joint mechanism 31, this structure forms no part of the present invention but is described and claimed in the co-pending application of the applicant filed December 10, 1947, Serial No. 790,881. H

From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art that this invention provides an improved manner of releasably maintaining the cylinder of a removable cylinder lock in place in its bore.

What I claim as: my invention is I. In a loci; of the type having a casing bored to rotatably' receive a lock cylinder and wherein '1 thejlock cylinder is removable from the front of the casing, means readily detachably maintaining the cylinder against axial motion out of the bore comprisingpa shoulder on the cylinder having a surface faeing thefron't'of the casing; anda retaining member carried by the casingat the interior thereof and having a part movable from a normally operative position projectinginto the part on the retainingmember projects into the casingbore and into an arcuategroove in the exterior of the lock cylinder to preclude axial withdrawal of the cylinder from the bore, said part being engageable with at least one end of the arcuate grooveto define one of the limits of a 1 rotation of the cylinder in said bore.

tached at one end to the front part of the casing and having its free end portion received in a rearwardly extending longitudinalgroove in the casing' communicating with the bore thereof, said blade lying alongside the cylinder and having a hook on its free extremity bent inwardly into the casing bore to lie ahead of said shoulder and casingmeans. readily detachably maintaining the I cylinder against axial withdrawal from the casing bore comprising: a relatively flat substantially T-shaped spring blade having its head received edgewise in a longitudinally extending slit cut across the front of the casing close to the bore thereof with the underside of the head engaging the'bottom of the slit and so that the head lies.

crosswise of the-axis of the bore, the stem of the blade projecting rearwardly from thehead along the exterior of the cylinder and being received in a groove in r the casing communicating with the v casing bore; a hook on the free end ofthe stem bent'inwardly into the casingbore and yieldingly maintained engaged in an arcuate groove in the rear of the cylinder to hold the same against with- REFERENCES CITED drawal from the casing bore; an escutcheon cap The following refe ences are of record in the fixed over the front of the casing and closing the file of this patent: extrance to said slit; and means on the head of 5 v the blade engaging the escutcheon cap to prevent UNITED STATES PATENTS shifting of the blade relative to the casing. Number e Date 6. The lock set forth in claim 5 wherein the 1, 75,091 Best Mar. 2, 1926 free end of the blade bears against a portion of 1,797,725 Jacobi Mar. 24, 1931 the lock cylinder under spring pressure to min- 10 imize rattling of the cylinder in the casing bore.

EDWARD N. JACOBI. 

